std::in_place_tag

 

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in_placein_place_tin_place_type_tin_place_index_t

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Defined in header <utility>
struct in_place_tag { in_place_tag() = delete; };		(since C++17)

std::in_place_tag is an empty class type used as the return types of the std::in_place functions for disambiguation.

See also

in_place in_place_t in_place_type_t in_place_index_t (since C++17)

in-place construction tag (function template)